In his 2012 page-turner, My American Revolution: A Modern Expedition Through History's Forgotten Battlegrounds, Robert Sullivan embarks on a journey that will be familiar to the 50-something male of the species, noticing with fresh eyes the historical stuff in his immediate surroundings, steadily expanding the scope and intensity of his search, and ending up in a state so obsessive that he's sending mirrored sun signals to his blasé teenaged dau…